/*
 * $Id: MCFieldFlattener.java 5943 2013-08-08 10:03:09Z blowagie $
 *
 * This file is part of the iText (R) project.
 * Copyright (c) 1998-2014 iText Group NV
 * Authors: Bruno Lowagie, et al.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License version 3
 * as published by the Free Software Foundation with the addition of the
 * following permission added to Section 15 as permitted in Section 7(a):
 * FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY
 * ITEXT GROUP. ITEXT GROUP DISCLAIMS THE WARRANTY OF NON INFRINGEMENT
 * OF THIRD PARTY RIGHTS
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU Affero General Public License for more details.
 * You should have received a copy of the GNU Affero General Public License
 * along with this program; if not, see http://www.gnu.org/licenses or write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA, 02110-1301 USA, or download the license from the following URL:
 * http://itextpdf.com/terms-of-use/
 *
 * The interactive user interfaces in modified source and object code versions
 * of this program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU Affero General Public License.
 *
 * In accordance with Section 7(b) of the GNU Affero General Public License,
 * a covered work must retain the producer line in every PDF that is created
 * or manipulated using iText.
 *
 * You can be released from the requirements of the license by purchasing
 * a commercial license. Buying such a license is mandatory as soon as you
 * develop commercial activities involving the iText software without
 * disclosing the source code of your own applications.
 * These activities include: offering paid services to customers as an ASP,
 * serving PDFs on the fly in a web application, shipping iText with a closed
 * source product.
 *
 * For more information, please contact iText Software Corp. at this
 * address: sales@itextpdf.com
 */

using System.IO;

namespace iTextSharp.text.pdf.mc {

    /**
     * Removes all interactivity from an AcroForm, maintaining the
     * structure tree.
     * 
     * DISCLAIMER:
     * - Use this class only if the form is properly tagged.
     * - This class won't work with pages in which the CTM is changed
     * - This class may not work for form fields with more than one widget annotation
     */
    public class MCFieldFlattener {
        /**
         * Processes a properly tagged PDF form.
         * @param reader the PdfReader instance holding the PDF
         * @throws IOException
         * @throws DocumentException 
         */
        virtual public void Process(PdfReader reader, Stream os) {
            int n = reader.NumberOfPages;
            // getting the root dictionary
            PdfDictionary catalog = reader.Catalog;
            // flattening means: remove AcroForm
            catalog.Remove(PdfName.ACROFORM);
            // read the structure and create a parser
            StructureItems items = new StructureItems(reader);
            MCParser parser = new MCParser(items);
            // loop over all pages
            for(int i = 1; i <= n; i++) {
                // make one stream of a content stream array
                reader.SetPageContent(i, reader.GetPageContent(i));
                // parse page
                parser.Parse(reader.GetPageN(i), reader.GetPageOrigRef(i));
            }
            reader.RemoveUnusedObjects();
            // create flattened file
            PdfStamper stamper = new PdfStamper(reader, os);
            items.WriteParentTree(stamper.Writer);
            stamper.Close();
        }
    }
}
